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arXiv 0710.1353cond-mat.str-el
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非平衡费米子布居对形成的精确数值研究

Exact Numerical Study of Pair Formation with Imbalanced Fermion Populations

G. G. Batrouni, M. H. Huntley, V. G. Rousseau, R. T. Scalettar

摘要:

本文对费米子布居不平衡的吸引一维哈伯德模型进行了量子蒙特卡罗研究。对-对关联函数在没有极化P的情况下单调衰减,当P不为零时产生振荡,这是Fulde-Ferrell-Larkin-Ovchinnikov相位的特征。对动量分布在等于费米动量差的动量处达到峰值。在强耦合,少数和多数的动量分布被示出为变形,反映了其他物种的存在下,其费米面。FFLO振荡在限制势的存在下仍然存在,并且陷阱中心的局部极化表现出明显的下降,与实验观察到的相似。

英文摘要:

We present an exact Quantum Monte Carlo study of the attractive 1-dimensional Hubbard model with imbalanced fermion population. The pair-pair correlation function, which decays monotonically in the absence of polarization P, develops oscillations when P is nonzero, characteristic of Fulde-Ferrell-Larkin-Ovchinnikov phase. The pair momentum distribution peaks at a momentum equal to the difference in the Fermi momenta. At strong coupling, the minority and majority momentum distributions are shown to be deformed, reflecting the presence of the other species, and its Fermi surface. The FFLO oscillations survive the presence of a confining potential, and the local polarization at the trap center exhibits a marked dip, similar to that observed experimentally.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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